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HABITS   OF   KSHZOMYS

483

species the large intestine is slightly shorter than the small
intestine. In tth- badius the two parts of the gut are almost
exactly equal in length. There are three pairs of inguinal and
two pairs of pectoral teats. The name ffliizetnys appears to hare
"been given to the animals of this genus for the reason that they
feed largely on roots. They burrow, and, like many ofcher
burrowing animals, feed in the evening. As is the case with
other forms, Ithizomys is said to burrow with the assistance of
its teeth as well as of its claws.

Fia. 237.—Bamboo Rat.    Rhizomes badius.      x £„
Tachyoryctes is an African genus closely allied to the last. There
are three Ethiopian species. It is mainly to be distinguished by
the different pattern upon the grinding surface of the molars.
Fam. 5. Geomyidae.—This family of burrowing Rodents is
limited to North and Central America. The animals have cheek
pouches, and small eyes and ears, in accordance with their mode
of life. The claws of the fore-limbs are very strongly developed.
The genus Geovnys contains some eight species, which are
Central and North American, not extending, however, far north.
The incisors of the upper jaw are grooved with two grooves.
There are three pairs of teats—one axillary, and the two remain-
ing inguinal
TJiomomys, without grooves on the incisors, reaches to Canada
in the north, and does not extend as Ikr south as the last genus.